一、循环服务器
伪代码：
sfd
=
socket
();
bind
();
listen
();
while
(
1
)
{
newfd
=
accept
();
while
(
1
)
{
recv
();
send
();
}
close
(
newfd
);
}
close
(
sfd
);
代码实现：
#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<string.h>
#include<netinet/in.h>
//打印错误信息
#define ERR_MSG(msg) do{\
fprintf(stderr,"__%d__",__LINE__); \
perror(msg);}while(0)
#define PORT 8888 //1024——49151
#define IP "192.168.31.73" //本机IP
int main(int argc, const char *argv[])
{
//创建流式套接字
int sfd = socket(AF_INET,SOCK_STREAM,0);
if(sfd < 0)
{
ERR_MSG("socket");
return -1;
}
printf("create socket success\n");
//允许端口快速重用
int reuse = 1;
if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse)) < 0)
{
ERR_MSG("setsockopt");
return -1;
}
//填充地址信息结构体,真实的地址信息结构体与协议族相关
//AF_INET
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(PORT); //网络字节序的端口号
sin.sin_addr.s_addr = inet_addr(IP); //网络字节序的IP地址
//将地址信息结构体绑定到套接字上
bind(sfd,(struct sockaddr *)&sin,sizeof(sin));
if(bind < 0)
{
ERR_MSG("bind");
return -1;
}
printf("bind success\n");
//将套接字设置为被动监听状态，让内核去监听是否有客户端链接
if(listen(sfd,10) < 0)
{
ERR_MSG("listen");
return -1;
}
printf("listen success\n");
struct sockaddr_in cin;
socklen_t addrlen = sizeof(cin);
while(1)
{
//从已经完成链接的队列头中，取出一个客户端的信息，创建生成一套新的套接字文件描述符
//该文件描述符才是与客户端通信的文件描述符
int newfd = accept(sfd,(struct sockaddr*)&cin,&addrlen);
if(newfd < 0)
{
ERR_MSG("accept");
return -1;
}
//网络字节序的IP--->点分十进制，网络字节序的poet---->本机字节序
printf("[%s : %d] newfd = %d\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd);
char buf[128] = "";
ssize_t res = 0;
while(1)
{
bzero(buf,sizeof(buf));
//循环接收
res = recv(newfd,buf,sizeof(buf),0);
if(res < 0)
{
ERR_MSG("recv");
return -1;
}else if(res == 0)
{
printf("newfd = %d 客户端退出\n",newfd);
break;
}
printf("[%s : %d] newfd = %d : %s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,buf);
//发送数据
strcat(buf,"*_*");
if(send(newfd,buf,sizeof(buf),0) < 0)
{
ERR_MSG("send");
return -1;
}
printf("send message success\n");
}
close(newfd);
}
close(sfd);
return 0;
}
二、多进程并发服务器
伪代码：
void
handler
(
int
sig
)
{
//
回收僵尸进程
//
回收成功则再回收一次，直到回收失败或者没有回收到为止
while
(
waitpid
(
-
1
,
NULL
,
WNOHANG
)
>
0
);
}
//
捕获
17
号信号
SIGCHLD
sighandler_t s
=
signal
(
17
,
handler
);
sfd
=
socket
();
bind
();
listen
();
while
(
1
)
{
newfd
=
accept
();
pid
=
fork
();
if
(
pid
>
0
)
{
close
(
newfd
);
}
else if
(
0
==
pid
)
{
close
(
sfd
);
while
(
1
)
{
ii.
代码示例
recv
();
send
();
}
close
(
newfd
);
exit
(
0
);
}
}
close
(
sfd
);
功能代码：
#include<signal.h>
#include<sys/wait.h>
#include<stdlib.h>
#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<string.h>
#include<netinet/in.h>
//打印错误信息
#define ERR_MSG(msg) do{\
fprintf(stderr,"__%d__",__LINE__); \
perror(msg);}while(0)
#define PORT 8888 //1024——49151
#define IP "192.168.31.73" //本机IP
typedef void(*sighandler_t)(int);
int cli_msg(int newfd,struct sockaddr_in cin);
void handler(int sig)
{
while(waitpid(-1,NULL,WNOHANG) > 0);
}
int main(int argc, const char *argv[])
{
//捕获17号信号
sighandler_t s = signal(17,handler);
if(SIG_ERR == s)
{
ERR_MSG("signal");
return -1;
}
//创建套接字
int sfd = socket(AF_INET,SOCK_STREAM,0);
if(sfd < 0)
{
ERR_MSG("socket");
return -1;
}
//允许端口快速重用
int reuse = 1;
if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse)) < 0)
{
ERR_MSG("setsockopt");
return -1;
}
//绑定客户端的地址信息结构体（非必须绑定)
//填充要连接的服务器的地址信息结构体
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(PORT);
sin.sin_addr.s_addr = inet_addr(IP);
//将地址信息结构体绑定到套接字上
bind(sfd,(struct sockaddr *)&sin,sizeof(sin));
if(bind < 0)
{
ERR_MSG("bind");
return -1;
}
printf("bind success\n");
//将套接字设置为被动监听状态，让内核去监听是否有客户端链接
if(listen(sfd,10) < 0)
{
ERR_MSG("listen");
return -1;
}
printf("listen success\n");
struct sockaddr_in cin;
socklen_t addrlen = sizeof(cin);
int newfd = 0;
pid_t pid = 0;
while(1)
{
newfd = accept(sfd,(struct sockaddr*)&cin,&addrlen);
if(newfd < 0)
{
ERR_MSG("newfd");
return -1;
}
printf("[%s : %d]newfd = %d\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd);
pid = fork();
if(pid > 0)
{
close(newfd);
}
else if(pid == 0)
{
cli_msg(newfd,cin);
close(newfd);
exit(0);
}
else
{
ERR_MSG("fork");
return -1;
}
}
close(sfd);
return 0;
}
int cli_msg(int newfd,struct sockaddr_in cin)
{
char buf[128] = "";
ssize_t res = 0;
while(1)
{
bzero(buf,sizeof(buf));
//循环接收
res = recv(newfd,buf,sizeof(buf),0);
if(res < 0)
{
ERR_MSG("recv");
return -1;
}else if(res == 0)
{
printf("newfd = %d 客户端退出\n",newfd);
break;
}
printf("[%s : %d] newfd = %d : %s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,buf);
//发送数据
strcat(buf,"*_*");
if(send(newfd,buf,sizeof(buf),0) < 0)
{
ERR_MSG("send");
return -1;
}
printf("send message success\n");
}
}
三、多线程并发服务器
伪代码：
sfd
=
socket
();
bind
();
listen
();
struct
msg cliInfo
;
while
(
1
)
{
newfd
=
accept
();
cliInfo
.
newfd
=
newfd
;
pthread_create
(
&
tid
,
NULL
,
callback
,
&
cliInfo
);
}
void*
callBack
(
void*
arg
)
{
pthread_detach
(
pthread_self
());
while
(
1
)
{
recv
();
send
();
}
close
(
newfd
);
pthread_exit
()
}
代码实现：
#include<signal.h>
#include<sys/wait.h>
#include<stdlib.h>
#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<string.h>
#include<netinet/in.h>
#include<pthread.h>
#include<fcntl.h>
//打印错误信息
#define ERR_MSG(msg) do{\
fprintf(stderr,"__%d__",__LINE__); \
perror(msg);}while(0)
#define PORT 8888 //1024——49151
#define IP "192.168.31.73" //本机IP
struct msg
{
int newfd;
struct sockaddr_in cin;
};
void *msg_cli(void *arg)
{
pthread_detach(pthread_self());
int newfd = ((struct msg *)arg)->newfd;
struct sockaddr_in cin = ((struct msg *)arg)->cin;
char buf[128] = "";
ssize_t res = 0;
while(1)
{
bzero(buf,sizeof(buf));
//循环接收
res = recv(newfd,buf,sizeof(buf),0);
if(res < 0)
{
ERR_MSG("recv");
}else if(res == 0)
{
printf("newfd = %d 客户端退出\n",newfd);
break;
}
printf("[%s : %d] newfd = %d : %s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,buf);
//发送数据
strcat(buf,"*_*");
if(send(newfd,buf,sizeof(buf),0) < 0)
{
ERR_MSG("send");
}
printf("send message success\n");
}
close(newfd);
pthread_exit(NULL);
}
int main(int argc, const char *argv[])
{
//创建套接字
int sfd = socket(AF_INET,SOCK_STREAM,0);
if(sfd < 0)
{
ERR_MSG("socket");
return -1;
}
//允许端口快速重用
int reuse = 1;
if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse)) < 0)
{
ERR_MSG("setsockopt");
return -1;
}
//绑定客户端的地址信息结构体（非必须绑定)
//填充要连接的服务器的地址信息结构体
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(PORT);
sin.sin_addr.s_addr = inet_addr(IP);
//将地址信息结构体绑定到套接字上
bind(sfd,(struct sockaddr *)&sin,sizeof(sin));
if(bind < 0)
{
ERR_MSG("bind");
return -1;
}
printf("bind success\n");
//将套接字设置为被动监听状态，让内核去监听是否有客户端链接
if(listen(sfd,10) < 0)
{
ERR_MSG("listen");
return -1;
}
printf("listen success\n");
struct sockaddr_in cin;
socklen_t addrlen = sizeof(cin);
int newfd = 0;
struct msg msg;
pthread_t tid;
while(1)
{
newfd = accept(sfd,(struct sockaddr*)&cin,&addrlen);
if(newfd < 0)
{
ERR_MSG("newfd");
return -1;
}
msg.newfd = newfd;
msg.cin = cin;
if(pthread_create(&tid,NULL,msg_cli,(void *)&msg) != 0)
{
ERR_MSG("pthread_create");
return -1;
}
}
close(sfd);
return 0;
}
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